For the IDA71 homebuilder

jaap · 3rd September 2006, 17:54

Quote: (Originally Posted by Dave Sutton)

(7): Adding a drysuit piss-zipper (relief zipper) to the counterlung makes is easy to access the inside for maintenance and drying.. ;-). (And I bet that's the firt time ya'll have thought about that....!). Easy to add and not expensive.... waterproof zippers are great things in counterlungs!

Best to all,

Dave Sutton

Hi

Yes thats a nice thing, did you help Lasse Ljungqvist at Divex in Stockholm to come up with that? He has had an IDA-71 with a piss-zipper in his store for at least 7-8 years now.

pbsouthwood · 4th September 2006, 09:38

[quote=Dave Sutton;65197]Hey Guys,

Some words from the one who started it all in the IDA-71 world... ;-)

(1): We have abandoned the single scrubber configuration for al diving below perhaps 20 meters. We now use both scrubbers, internal 02 bottle, and external diluent slung as a stage bottle and fed to the rig thru quick disconnects. Choose the size of the stage to suit depth and bailout requirements. My own rig now allows modular use of single scrubber and internal diluent and two scrubbers with external diluent.... choose according to workload and depth intended.

Hi Dave,
What made you decide on a depth restriction for the single scrubber use?
Do you find:
1 The scrubber is less efficient at greater depths, making the second one necessary?
2 You work harder - produce more CO2 at greater depths?
3 You are not too worried about breakthrough at shallow depths because you can bail out easily?
4 Some other reason I cant think of right now?
Cheers,
Peter

**Dave Sutton** · 4th September 2006, 14:43

Two answers in one:

DIVEX: I'm not sure if I mentioned the zipper to him, he sent me an (EXCELLENT!) regulator that they build for test about that time (Did I mention that DIVEX regulators are EXCELLENT?) and might have discussed the piss zipper, cannot remember.

The depth limit we've placed on the IDA-71 single scrubber configuration is based on emprirical evidence: I *personally* had a couple of hypercapnia incidents on the thing in the single scrubber configuration in deeper water. I recovered both situations by STOPPING and resting for a minute, but trust me: The stimulus to panic and bolt for the surface was fully triggered and trust me on this too: I DO NOT get triggered to want to do that. It's a purely physiological responce to hypercapnia. I recognized it, rested, and was back to normal in 1 minute. With that said, (A): I'm not sure that many divers would recognbize the problem for what is was, and (B): I was lucky to be in a position where I could stop and rest. OC Bailout was, of course, available at the twist of a knob (I *always* dive an OC/CC DSV on rigs other than my mini-breather).

Physiologically, the depth issue is as follows: Just like 02 being measured by partial pressure and not percent, C02 partial pressure for any given percent of C02 in the loop also rises with depth. Your physiology responds to C02 *partial pressure* and high PPC02 is what triggers the hypercapnia. So deeper the depth, the more efficient the C0 removal must be.

Bottom line: DO NOT think for a minute that a single scrubber IDA-71 will give you the scrubber capacity for deep diving. Shallow water? It's fine. It's probably fine ideeper in warm water and low workload diving too. My problems were in North Atlantic, cold, turbid, deep, dry-suited, full-game wreck diving. In this arena you need all of the cards in your hand to be aces (which is why I'm diving my Mark-15 here for "serious" diving again).

Dave Sutton

dave · 20th September 2006, 06:56

anyone know how to put pictures in messages?I am computer challenged is what my son tells me.

Corallaro · 14th November 2006, 14:55

As I see in attached bitmap the interstice in the scrubber isn't usable as water trap, the exaled gas and the water first go in sodalime then in the interstice, i can invert scrubbers hole??

zepp · 18th November 2006, 16:08

Quote: (Originally Posted by Corallaro)

As I see in attached bitmap the interstice in the scrubber isn't usable as water trap, the exaled gas and the water first go in sodalime then in the interstice, i can invert scrubbers hole??

I use my scrubber the 'wrong' way around with no problem but the space to collect any water is still minimal.

Corallaro · 28th November 2006, 10:54

I see your photos...triple cell holder and displays....

what type of diplay you used and the case?

3rd September 2006, 17:54	#11 (permalink)
jaap Normal people worry me Current Rebreather/s: Classic Kiss Other CCR RB80 / Clone Ray Other SCR Home Build Other Rebreather/s: Other CCR RB80 / Clone Ray Other SCR Home Build Join Date: Jun 2005 Location: Stockholm Sweden Posts: 473	Re: For the IDA71 homebuilder Quote: (Originally Posted by Dave Sutton) (7): Adding a drysuit piss-zipper (relief zipper) to the counterlung makes is easy to access the inside for maintenance and drying.. ;-). (And I bet that's the firt time ya'll have thought about that....!). Easy to add and not expensive.... waterproof zippers are great things in counterlungs! Best to all, Dave Sutton Hi Yes thats a nice thing, did you help Lasse Ljungqvist at Divex in Stockholm to come up with that? He has had an IDA-71 with a piss-zipper in his store for at least 7-8 years now.
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4th September 2006, 09:38	#12 (permalink)
pbsouthwood New Member Current Rebreather/s: Other SCR Other Rebreather/s: Other SCR Join Date: Sep 2005 Location: South Africa Posts: 10	Re: For the IDA71 homebuilder [quote=Dave Sutton;65197]Hey Guys, Some words from the one who started it all in the IDA-71 world... ;-) (1): We have abandoned the single scrubber configuration for al diving below perhaps 20 meters. We now use both scrubbers, internal 02 bottle, and external diluent slung as a stage bottle and fed to the rig thru quick disconnects. Choose the size of the stage to suit depth and bailout requirements. My own rig now allows modular use of single scrubber and internal diluent and two scrubbers with external diluent.... choose according to workload and depth intended. Hi Dave, What made you decide on a depth restriction for the single scrubber use? Do you find: 1 The scrubber is less efficient at greater depths, making the second one necessary? 2 You work harder - produce more CO2 at greater depths? 3 You are not too worried about breakthrough at shallow depths because you can bail out easily? 4 Some other reason I cant think of right now? Cheers, Peter
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4th September 2006, 14:43	#13 (permalink)
Dave Sutton Diveshop of Horrors Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Evolution Megalodon rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,907	Re: For the IDA71 homebuilder Two answers in one: DIVEX: I'm not sure if I mentioned the zipper to him, he sent me an (EXCELLENT!) regulator that they build for test about that time (Did I mention that DIVEX regulators are EXCELLENT?) and might have discussed the piss zipper, cannot remember. The depth limit we've placed on the IDA-71 single scrubber configuration is based on emprirical evidence: I personally had a couple of hypercapnia incidents on the thing in the single scrubber configuration in deeper water. I recovered both situations by STOPPING and resting for a minute, but trust me: The stimulus to panic and bolt for the surface was fully triggered and trust me on this too: I DO NOT get triggered to want to do that. It's a purely physiological responce to hypercapnia. I recognized it, rested, and was back to normal in 1 minute. With that said, (A): I'm not sure that many divers would recognbize the problem for what is was, and (B): I was lucky to be in a position where I could stop and rest. OC Bailout was, of course, available at the twist of a knob (I always dive an OC/CC DSV on rigs other than my mini-breather). Physiologically, the depth issue is as follows: Just like 02 being measured by partial pressure and not percent, C02 partial pressure for any given percent of C02 in the loop also rises with depth. Your physiology responds to C02 partial pressure and high PPC02 is what triggers the hypercapnia. So deeper the depth, the more efficient the C0 removal must be. Bottom line: DO NOT think for a minute that a single scrubber IDA-71 will give you the scrubber capacity for deep diving. Shallow water? It's fine. It's probably fine ideeper in warm water and low workload diving too. My problems were in North Atlantic, cold, turbid, deep, dry-suited, full-game wreck diving. In this arena you need all of the cards in your hand to be aces (which is why I'm diving my Mark-15 here for "serious" diving again). Dave Sutton __________________ "Silent Diving with No Bubbles and No Politics".... www.nobubblediving.com Last edited by Dave Sutton : 4th September 2006 at 14:46.
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20th September 2006, 06:56	#14 (permalink)
dave New Member Current Rebreather/s: Other CCR Home Build Other Rebreather/s: Other CCR Home Build Join Date: Oct 2005 Location: canada Posts: 8	Re: For the IDA71 homebuilder anyone know how to put pictures in messages?I am computer challenged is what my son tells me.
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18th November 2006, 16:08	#16 (permalink)
zepp "Dyson with Death" daddy Current Rebreather/s: Classic Kiss Other CCR Home Build Other Rebreather/s: Not Bought Yet Other CCR Home Build Join Date: Sep 2005 Location: midlands Posts: 284	Re: For the IDA71 homebuilder Quote: (Originally Posted by Corallaro) As I see in attached bitmap the interstice in the scrubber isn't usable as water trap, the exaled gas and the water first go in sodalime then in the interstice, i can invert scrubbers hole?? I use my scrubber the 'wrong' way around with no problem but the space to collect any water is still minimal. __________________ I'm not a bad person.....HONEST my homebuild photos http://www.rebreatherworld.com/photo...ery.php/cat/48 CLASSIC KISS #052/shearwater The Dyson is back
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28th November 2006, 10:54	#17 (permalink)
Corallaro IDA-71,IDA-76,NaubosAR90 Current Rebreather/s: Other CCR Other Rebreather/s: Not Bought Yet Other CCR Join Date: Oct 2006 Location: Italia - Sicilia Posts: 248	Re: For the IDA71 homebuilder I see your photos...triple cell holder and displays.... what type of diplay you used and the case?
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